MIPS 24um observations of the HDFS Virtual Observatory Resource

Authors
  1. Huynh M.T.
  2. Gawiser E.
  3. Marchesini D.
  4. Brammer G.
  5. Guaita L.
  6. Published by
    CDS
Abstract

We present MIPS 24um observations of the Hubble Deep Field South taken with the Spitzer Space Telescope. The resulting image is 254arcmin^2^ in size and has a sensitivity ranging between ~12 and ~30uJy rms, with a median sensitivity of ~20uJy rms. A total of 495 sources have been catalogued with a signal-to-noise ratio greater than 5{sigma}. The source catalog is presented as well as source counts which have been corrected for completeness and flux boosting. The IR sources are then combined with MUSYC optical/NIR and ATHDFS radio observations to obtain redshifts and radio flux densities of the sample. We use the IR/radio flux density ratio (q_24_) to explore the IR-radio correlation for this IR sample and find q_24_=0.71+/-0.31 for sources detected in both IR and radio. The results are extended by stacking IR sources not detected in the radio observations and we derive an average q_24_ for redshift bins between 0<z<2.5. We find that the high-redshift (z>1) sources have an average q_24_ ratio which is better fit by local LIRG SEDs rather than local ULIRG SEDs, indicating that high-redshift ULIRGs differ in their IR/radio properties. So, ULIRGs at high-redshift have SEDs different from those found locally. Infrared-faint radio sources are examined, and while nine radio sources do not have an MIPS detection and are therefore radio-loud active galactic nuclei (AGNs), only one radio source has an extreme IRAC 3.6um to radio flux density ratio indicating it is a radio-loud AGN at z>1.

Keywords
  1. infrared-photometry
  2. galaxies
  3. infrared-sources
  4. radio-sources
Bibliographic source Bibcode
2010ApJ...723.1110H
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https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/723/1110
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/723/1110
Document Object Identifer DOI
doi:10.26093/cds/vizier.17231110

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History

2012-08-14T08:45:32Z
Resource record created
2012-08-14T08:45:32Z
Created
2017-10-09T13:33:44Z
Updated

Contact

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CDS support team
Postal Address
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E-Mail
cds-question@unistra.fr